Introduction to gpsurya blog
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In this blog you will find around 320 solved Geophysics GATE and CSIR-NET and other competitive exams solutions with a better explanation. Please follow and share if you like it.
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GATE-2016 (39)
39) In a rock sample the values of $(\frac{87_{sr}}{86_{sr}})_{parent}$ and $(\frac{87_{Rb}}{86_{sr}})_{parent}$ are 0.7125 and 0.2 respectively. The decay constant (ʎ) $87_{Rb}$ is 1.42 * 10 -11 …